Manitowoc Ice QuietQube Dual Expansion Valve User manual

Manitowoc Ice
Brand
Manitowoc Ice
Model
QuietQube Dual Expansion Valve
Type
User manual
Manitowoc Service Seminar Guidebook
28
S QuietQube
®
- Symptom #2 – Ice Machine has a Long Freeze Cycle
QuietQube
Ice Machines Refrigeration Diagnostic Chart
Dual Expansion Valve
Operational Analysis 1 2 3 4
Ice Production Published 24 hour ice production_____________
Calculated (actual) ice production_____________
NOTE: The ice machine is operating properly if the ice fill patterns is normal
and ice production is within 10% of charted capacity.
Installation and Water System
All installation and water related problems must be corrected before proceeding with chart.
Ice Formation Pattern
Left side _____________________
Right side ___________________
Ice formation is thin on
top of one evaporator
-or-
No ice formation on
bottom half of one
evaporator
Normal
-or-
Ice formation is
extremely thin on top of
one or both evaporators
-or-
No ice formation on one
or both evaporators
Ice formation normal on
both evaporators
-or-
Ice formation is
extremely thin on bottom
of one evaporator
-or-
No ice formation on one
evaporator
Ice formation normal
-or-
No ice formation on both
evaporators
Safety limits
Refer to "Analyzing Safety Limits"
to eliminate all non-refrigeration
problems.
Stops on safety limit:
1 or 2
Stops on safety limit:
1 or 2
Stops on safety limit:
1 or 2
Stops on safety limit:
1
Freeze Cycle
Discharge Pressure
_______ _______ ________
1 minute Middle End
into cycle
If discharge pressure is high or Low refer to freeze cycle high or low discharge pressure problem checklist to
eliminate problems and/or components not listed on this table before proceeding.
Freeze Cycle
Suction Pressure
If suction pressure is High or Low refer to freeze cycle high or low suction pressure problem checklist to
eliminate problems and/or components not listed on this table before proceeding.
_______ _______ ________
1 minute Middle End
into cycle
Suction pressure is
High
Suction pressure is
Low
Suction pressure is
High
Suction pressure is
High
Cool Vapor Valve
Audible refrigerant flow
through left or right valve
in freeze cycle
No audible refrigerant
flow through left or right
valve in freeze cycle
No audible refrigerant
flow through left or right
valve in freeze cycle
No audible refrigerant
flow through left or right
valve in freeze cycle
Suction Line Temperature
Attach a temperature probe on the
suction line within 6” of the shut-off
valve outlet.
Record the low event at the end of
the freeze cycle.
Suction line temperature
at the suction shut-off
valve is
greater than 10F
at the end of the freeze
cycle
Suction line temperature
at the suction shut-off
valve is
greater than 10F
at the end of the freeze
cycle
Suction line temperature
at the suction shut-off
valve is
less than 10F
at the end of the freeze
cycle
Suction line temperature
at the suction shut-off
valve is
greater than 10F
at the end of the freeze
cycle
Final Analysis
Enter total number of boxes
checked in each column.
Cool Vapor Valve
Leaking
Low on Charge
-or-
TXV Starving
TXV Flooding
Compressor
  • Page 1 1

Manitowoc Ice QuietQube Dual Expansion Valve User manual

Manitowoc Ice
Brand
Manitowoc Ice
Model
QuietQube Dual Expansion Valve
Type
User manual
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